A study on the thermal expansion characteristics of Inconel-82® filler wire by high temperature X-ray diffraction

Abstract

The lattice parameter ( a) change with respect to temperature ( T) has been measured by high temperature X-ray diffraction (HT-XRD) technique for Inconel-82® 1 1 ®Inconel is the registered trademark of Inco group of companies. filler wire used in the TIG welding of a dissimilar joint involving Inconel-600® and commercially pure iron. By taking proper precautions to minimise the temperature gradient across the sample thickness, and by suitably calibrating the shift in 2 θ produced as a result of sample buckling at high temperatures, we could obtain fairly reliable estimates of lattice parameter in the temperature range 300–1200 K. The lattice parameter and the coefficient of mean linear thermal expansion at 300 K, have been found to be 3.546(2)×10 −10 m and 11.03×10 −6 K −1, respectively.